CVE-2023-31431
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA buffer overflow vulnerability in “diagstatus” command in Brocade Fabric OS before Brocade Fabric v9.2.0 and v9.1.1c could allow an authenticated user to crash the Brocade Fabric OS switch leading to a denial of service.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA buffer overflow vulnerability exists in the 'diagstatus' diagnostic command of Brocade Fabric OS. The flaw allows an authenticated user to trigger the overflow by providing oversized input to the diagstatus command, causing the switch to crash and resulting in denial of service.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 9.1.1c= 9.2.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the Fabric OS versionLog into the switch CLI and run the command `version` or `firmwareShow` to display the installed Brocade Fabric OS versionAffected if The displayed version is below 9.1.1c, or exactly 9.2.0
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Confirm the exact version numberExamine the version output carefully - look for the full version string such as 9.1.1, 9.1.1b, 9.2.0, or laterAffected if The version shows 9.2.0 exactly, or any version lower than 9.1.1 such as 9.1.0, 9.0.x, 8.x.x, etc.
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Verify diagstatus command availabilityAs an authenticated user, attempt to access the diagnostic command by running `diagstatus` or checking help via `help diagstatus`Affected if The command is accessible, indicating the diagnostic feature is enabled for authenticated users
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Cross-reference with CVE version matrixCompare your confirmed version against the known affected ranges: versions < 9.1.1c and version = 9.2.0 are vulnerableAffected if Your installed version matches either of these ranges
You are affected if the installed Brocade Fabric OS version is 9.2.0 or any version lower than 9.1.1c.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped9.1.1c
Upgrade Brocade Fabric OS to version 9.2.0 or 9.1.1c or later to remediate this vulnerability.
Brocade Fabric OS v9.1.1c or v9.2.0 (or later)
- 1. Identify the current Brocade Fabric OS version using the 'version' or 'firmwareShow' command
- 2. Plan the upgrade - review Broadcom compatibility guides and backup the current switch configuration
- 3. Download the fixed firmware (v9.1.1c or v9.2.0 or later) from the Broadcom support portal (support.broadcom.com)
- 4. Upload the firmware to the switch using 'firmwareDownload' or the appropriate method for your hardware
- 5. After upgrade completes, verify the new version is installed using 'version' command
- 6. Confirm the 'diagstatus' command functions normally and test the fix
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-31431 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-31431 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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